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Time Calculator

By Rolf Assfalg

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You can add, subtract and convert time-expressions. How long have you been at work today? - So type in: "17:30 - 7:45 =" where 17 stands for 5pm so 17:30 means 5:30pm. As a result you get: 09:45 (9 hours and 45 minutes). you can convert this result in fractions of hours. Therefore press "hours" (at the bottom, right in the middle) and you get "9.75 hrs". Alternatively, you can enter factions of hours. For example: 1.75 + 0:15 = will result in 2:00 (means two hours)

Adding multiple timespans
You can add up several amounts of time, such as working hours (hours account) or flight times (log / personal flight log if you are a pilot). Example: An airplane has a total running time of 4873h and 53min. In the airplanes flightlog book, individual flight hours are to be added up.
4873:53 +1:23 +:45 + .... +1:34 and so on. (this is the reason why the editor has a few more lines) By pushing "=", the result will appear in the output field, and with the buttons (at the bottom) you can convert the result.
Calculation of timespans crossing the dateline
Suppose you are working night shift and you are beginning at 8:13pm in the evening. Your work ends on 4:32am in the early morning. For the calculation, enter:
4:32 -20:13 =
In mode "d h:m:s" (at the bottom, far left button), you get the following output: "timespan: 08h: 19m: 00s.". Unlike this, if you would like to subtract hours and minutes in the mathematical sense, press "h:m:s" (bottom, second from left) and you get "-15h: 41m: 00s".

Further Examples:
00:02 -23:58 = (mode "d d:m:s"): timespan: 00h:04m:00s (Midnight cross)
23:58-00:02 = (mode "d:m:s") : 23h:56m:00s (mathematical result)
Midnight cross will be only detected, when the first number is minor the second one.

Examples for Entering timespans and clock times

10:45:30 - (10 hours, 45 minutes and 30 seconds)
:30:20 - (30 minutes and 20 seconds)
10:14.5 - (10 hours and 14.5 minutes or 14 min and 30 sec)
::25 - (25 seconds)

What's New in Version 1.5

Supporting backward compatibility to iOS 4.0 and higher.

iPhone Screenshots

iPhone Screenshot 1
iPhone Screenshot 2

Customer Reviews

Useful App

This app is very useful and I use it often. It has a simple interface and does what it is supposed to do. There's nothing else out there like it. Thanks for making it!


First of all I don't think you should have to put the colons in. It should automatically add the colons for every 2 digits (except in the hours column) Similarly - to type in :10 seconds plus :10 seconds should NOT require you to manually type 00:00:10 plus 00:00:10. When you only type :10 it should know you are referring to seconds.

Needs work

It requires a user to enter longer strings for no real reason. It should default to seconds only if a user enters just two digits. Instead it interprets it as hours or minutes. Also, there is no preset option for minutes and seconds only. So if a string is xx it is second, if the strings is xxxx it should be minutes and seconds, etc.

Time Calculator
View in iTunes
  • $0.99
  • Category: Business
  • Updated:
  • Version: 1.5
  • Size: 1.8 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 4.3 or later. Compatible with iPhone, iPad, and iPod touch.

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